User Guide for Campus Manager 3.3
Implementing VLANs in Your Ethernet Network
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Implementing VLANs in Your Ethernet Network

Table Of Contents

Implementing VLANs in Your Ethernet Network

What You Need—Prerequisites

How to Do It—Procedure

Create an Ethernet VLAN

Add End-User Ports to the VLAN

Enable or Disable the VLAN on a Trunk

Where You Should End Up—Verification


Implementing VLANs in Your Ethernet Network


As a network administrator for a company, you are constantly looking for ways to improve your network manageability, performance, and security. You have done some research and have learned about the benefits of VLANs; simplification of moves, adds, and changes; controlled broadcast activity; and workgroup and network security. See the "Virtual LANs (VLANs)" section for more information.

In this scenario, let's assume the network configuration consists of ten LAN switches and several VLANs in a VTP domain called "North Carolina." You can use Topology Services to help you manage these VLANs and create additional VLANs easily.


Note The network design used in this scenario is intended to illustrate how to use Campus Manager applications to manage your network. It is not a guideline for designing your network. For instructions on designing networks, consult the network design guidelines.


This scenario focuses on creating a new Ethernet VLAN and moving ports into this VLAN. To create a Token Ring VLAN, the steps are essentially the same. However the menu options are different. See the Topology Services online help for the procedure to create Token Ring VLANs.

To create the Ethernet VLAN as described in this scenario, see these sections:

What You Need—Prerequisites

How to Do It—Procedure

Where You Should End Up—Verification

What You Need—Prerequisites

In this scenario, you will use these applications:

Topology Services

VLAN Port Assignment

Discrepancy Reports

In this particular network scenario, there are two VTP servers, three VTP clients, and five switches in VTP transparent mode. See the "VTP Domains" section for more information about Virtual Trunk Protocol (VTP).

You should also check for discrepancies in your network. See Figure 10-1 for a network diagram of a VTP domain.

To do this:


Step 1 From the CiscoWorks desktop, select Campus Manager > Administration > Network Discrepancies. Make sure that the discrepancies that you are interested in are being collected.

Step 2 Select Campus Manager > Discrepancy  Reports > Physical Discrepancies to display the physical discrepancies. If you find discrepancies, you should resolve them before proceeding.

Step 3 Select Campus Manager > Discrepancy Reports > Logical Discrepancies to display the logical discrepancies. If you find discrepancies, you should resolve them before proceeding.

Step 4 Rediscover the network and check for discrepancies again. Repeat Steps 2 and 3 until all discrepancies have been resolved.


Figure 10-1 VTP Domain Network Configuration

How to Do It—Procedure

Use these procedures to implement VLANs in your network:

1. Create an Ethernet VLAN

2. Add End-User Ports to the VLAN

3. Enable or Disable the VLAN on a Trunk

Create an Ethernet VLAN

To create an Ethernet VLAN:


Step 1 From the CiscoWorks desktop, select Campus Manager > Topology Services to start Topology Services.

Step 2 Select Managed Domains > VTP Domains in the tree view.

Step 3 Select a VTP domain folder. The Ethernet VLAN you create depends on what you select in the tree view:

If you select a VTP domain folder, the VLAN will be created on a VTP server in that VTP domain (to include this VLAN on all switches configured as VTP transparent, select the Create VLAN on all Transparent Switches check box.) The VLAN information will be propagated throughout the VTP domain.

If you select a VTP domain folder with an IP address appended to it (denoting a switch in transparent mode), the VLAN will be created only on that switch.

Step 4 Select a VTP domain.

Step 5 Select Tools > VLAN Management > Create > Ethernet...

A window similar to the one shown in Figure 10-2 appears.

Figure 10-2 Create Ethernet VLAN Window

Step 6 Enter the appropriate information. See Table 10-1 for help filling in the required information.

Table 10-1 Create Ethernet VLAN Window Fields 

Field
Description

VTP Domain

Displays the name of the VTP domain that you selected. The VLAN will be created in this VTP domain.

VLAN Name

The name of the VLAN you want to create.

Topology Services provides a default VLAN name that follows a naming convention. The naming convention used for Ethernet VLANs in Topology Services is vlan[vlan index], for example, vlan2. You can accept the default name or enter another name. VLAN names must be unique within a given VTP domain.

VLAN Index

The index number of the VLAN.

The ANI Server computes the next available VLAN index. You can accept this VLAN index number or change the VLAN index to a number between 1 and 1024, that is currently not used. All VLAN index numbers must be unique.

If you change the VLAN index number and you are using a naming convention that reflects the index number, make sure to update the VLAN name to reflect the new index number.

Purpose

A word or phrase that describes the purpose of the VLAN.

Description

A description of the contents of the VLAN.

Create VLAN on all Transparent Switches

Allows you to include this VLAN on switches configured as VTP transparent.

LANE Services...

Allows you to create an ATM-VLAN. To create a standard Ethernet VLAN, do not click this button.

Initially, this button is greyed out. After you click Apply and successfully create a VLAN, this button is active if you have a network that contains ATM devices.


Step 7 Click Apply.


Add End-User Ports to the VLAN

After you have successfully created the VLAN in a VTP domain, add end-user ports (non-trunking ports) from one or more devices to this VLAN. To add ports to the VLAN:


Step 1 Select a domain from the tree view.

Step 2 Select Tools > VLAN Port Assignment....

The VLAN Port Assignment application opens, with the chosen domain already selected.

Step 3 In the Port Query panel, select the appropriate search criteria. For example, you can perform a search using the names of the devices from which you want to include ports. In Figure 10-3, a search was performed for devices whose names contain 209.165.

Step 4 Click Get Ports.

Ports that match the search criteria will be displayed.

Step 5 Select the ports you want to move. To select multiple ports, press the Ctrl key as you click on rows of ports; to select contiguous ports by press the Shift key as you click on rows of ports.

If you are selecting ports from a switch that is in transparent mode, the VLAN that you are moving the ports to must exist on that switch.

Step 6 Select the VLAN you just created from the drop-down list box for the Move selected ports to field.

Step 7 Click the Move button.

The ports are moved to the selected VLAN. See Figure 10-3 for an example of the VLAN Port Assignment window.


Figure 10-3 VLAN Port Assignment Window

Enable or Disable the VLAN on a Trunk

When you create a VLAN, trunks might be automatically included if the trunk has been configured to allow the index number for the VLAN you just created. For example, if the range of VLAN index numbers on a trunk is from 1 to 1024, and you create a VLAN with an index number 108, which falls within that range, the VLAN is automatically included on the trunk.

You might need to enable or disable the VLAN on a trunk to fit the configuration you desire. In this scenario, you will enable the VLAN on a trunk.

To enable a VLAN on a trunk:


Step 1 From the CiscoWorks desktop, select Campus Manager > VLAN Port Assignment.

Step 2 Select the domain from the VTP Domain drop-down list box.

Step 3 From the Port Query panel, select the appropriate search criteria.

Step 4 Click Get Ports. Ports that match the search criteria are displayed.

Step 5 Select the trunking port to which you want to add the VLAN. If you have access privileges to modify the parameters for the trunk, the Configure Trunk... button is activated.

Step 6 Click Configure Trunk....

The Trunk Attributes window opens.

Step 7 In the Allow VLAN(s) field, enter the index number of the VLAN you want to add to the trunk port.

Step 8 Click Apply.


Where You Should End Up—Verification

To confirm the creation of the VLAN and the VTP configuration:


Step 1 From the CiscoWorks desktop, select Campus Manager > Topology Services.

Step 2 Select Managed Views > VTP Domains >  VTP Domain name >  VLAN name. VTP Domain name is the domain where you created the VLAN, and VLAN name is the name of the VLAN you created. Observe that the VLAN you just created appears under the selected VTP domain folder.

Step 3 Click on the VLAN name in the VTP domain folder.

All of the ports you just added will be displayed. In addition, you will see ports that are trunking this VLAN. Figure 10-4, shows that VLAN0108 is created.


Figure 10-4 VLAN Summary Window